Roll DirectX Shader Compiler from 4242b576ed10 to 1c66c4d798b0 (2 revisions)

https://chromium.googlesource.com/external/github.com/microsoft/DirectXShaderCompiler.git/+log/4242b576ed10..1c66c4d798b0

2024-04-23 grroth@microsoft.com Disable non-legacy cbuffer flags (#6559)
2024-04-23 python3kgae@outlook.com [Sema] Report warning when mix packoffset with nonpackoffset (#6553)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/directx-shader-compiler-dawn
Please CC lokokung@google.com,webgpu-developers@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in DirectX Shader Compiler: https://github.com/microsoft/DirectXShaderCompiler/issues/new/choose
To file a bug in Dawn: https://bugs.chromium.org/p/dawn/issues/entry

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Bug: None
Tbr: lokokung@google.com
Change-Id: I49a6e95a55f041c9ae2c3b214bc3e9e38618f0ac
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/185500
Commit-Queue: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>
Bot-Commit: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>
diff --git a/DEPS b/DEPS
index 8574581..91f5bdd 100644
--- a/DEPS
+++ b/DEPS
@@ -204,7 +204,7 @@
   },
 
   'third_party/dxc': {
-    'url': '{chromium_git}/external/github.com/microsoft/DirectXShaderCompiler@4242b576ed109e0bb6fd87f70823f8dd40f0fd2c',
+    'url': '{chromium_git}/external/github.com/microsoft/DirectXShaderCompiler@1c66c4d798b02c62510a7b751303bea4cfd10849',
   },
 
   'third_party/dxheaders': {
diff --git a/third_party/dxc b/third_party/dxc
index 4242b57..1c66c4d 160000
--- a/third_party/dxc
+++ b/third_party/dxc
@@ -1 +1 @@
-Subproject commit 4242b576ed109e0bb6fd87f70823f8dd40f0fd2c
+Subproject commit 1c66c4d798b02c62510a7b751303bea4cfd10849